蓝桥杯_入门训练_圆的面积(四舍五入保留七位小数)
import java.util.*; public class Main { public static void main(String[] args){ Scanner sc= new Scanner(System.in); int r=sc.nextInt(); double s = Math.PI*r*r; System.out.println(String.format("%.7f",s)); } }
import java.util.*; public class Main { public static void main(String[] args){ Scanner sc= new Scanner(System.in); int r=sc.nextInt(); double s = Math.PI*r*r; System.out.println(String.format("%.7f",s)); } }